Fix (prettier.config.cjs): remove unsupported options

[drubetti]

@ianvs/prettier-plugin-sort-imports was removed here, but prettier.config.cjs still contains importOrder* options.

Running pnpm run format:write gives out warnings:

[warn] Ignored unknown option { importOrder: ["^(react/(.*)$)|^(react$)", "^(next/(.*)$)|^(next$)", "<THIRD_PARTY_MODULES>", "", "^types$", "^@/types/(.*)$", "^@/config/(.*)$", "^@/lib/(.*)$", "^@/hooks/(.*)$", "^@/components/ui/(.*)$", "^@/components/(.*)$", "^@/registry/(.*)$", "^@/styles/(.*)$", "^@/app/(.*)$", "", "^[./]"] }.
[warn] Ignored unknown option { importOrderSeparation: false }.
[warn] Ignored unknown option { importOrderSortSpecifiers: true }.
[warn] Ignored unknown option { importOrderBuiltinModulesToTop: true }.
[warn] Ignored unknown option { importOrderParserPlugins: ["typescript", "jsx", "decorators-legacy"] }.
[warn] Ignored unknown option { importOrderMergeDuplicateImports: true }.
[warn] Ignored unknown option { importOrderCombineTypeAndValueImports: true }.

This PR removes all importOrder* options, so that pnpm run format:write runs fine, without warnings.

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